Applies to:

Oracle Net Services - Version: 10.2.0.1 and later [Release: 10.2 and later ]Information in this document applies to any platform.
Connection from version 10.2.0.1 and newer.

Symptoms

JDBC OCI connections report NL-00303: syntax error in NV string and TNS-01153: Failed to process string in the listener log file.Strange characters can be seen in the listener log entries for the connection.Example here shows I^A^

That is a single address string does not produce an error in the listener.logSometimes when Oracle Net client tracing is enabled to support level (16),the problem will not reproduce.Oracle Net Client trace shows the problem reported after re-direction